Motivation and metacognitive science learning constructs of eighth grade students

This study aims to examine the relationship between eighth grade students' metacognitive science learning orientation towards science and their motivation towards science. In this study, quantitative research was conducted to determine and analyze the current situation. The causal comparison design will be used as the design of the research. The target population of the research consisted of all eighth grade students studying in middle schools in the province of Kütahya. The sample consists of 590 eighth grade students from seven different schools in the center of Kütahya. In this process, two scales were planned to be used: Self Efficacy and Metacognition Learning Inventory- Science (SEMLI-S) (Thomas, Anderson, & Nashon, 2008) and Science Motivation Scale to measure the motivational attitudes of eighth grade students in their science learning orientation. Exploratory and confirmatory factor analyses were performed to check the construct validity of the scale. At the same time, various descriptive and inferential statistics were performed. The first scale used in the research; SEMLI-S, which is a 5-point Likert type and consists of 4 sub-dimensions, was translated into Turkish in another study (Gokalp & Kirbulut, 2013). The validity and reliability were tested in a sample consisting of students at higher education level and the students were evaluated. In this study, the validity and reliability of the measurement tool were evaluated at the primary education level. The Science Motivation Scale, which will be used in the research, consists of 5 sub-dimensions, and its validity and reliability were tested in a sample consisting of secondary school students and the students were evaluated. In this study, the validity and reliability studies of the measurement tool were also evaluated at the primary education level. The results of the current showed that there is a strong correlation between students’ science motivation and their metacognitive science learning orientations (r=0.69). REFERENCES Gokalp, M. S., & Kirbulut, Z. D. (2013). Investigating pre-service elementary school teachers’ metacognitive science learning orientations. Anthropologist, 16(1-2), 177-184. Thomas G., Anderson D., & Nashon N. (2008). Development of an instrument designed to investigate elements of science students’ metacognition, self- efficacy and learning processes: The SEMLI-S. International Journal of Science Education, 30,1701-1724

Histological evaluation of the changes in the Blood-Testis Barrier for boraks use

AMAÇ: Günlük yaşantıda yaygın olarak kullanılan bor bileşiklerinin uzun süreli kullanımında değişik organlarda doza bağımlı toksik etki olabileceği yönünde bulgular mevcuttur. Bu amaçla çalışmamızda değişik dozlarda boraks kullanılan ratların testislerinde kan-testis bariyeri yapısında ve leydig hücre sayısında görülebilecek değişimi belirlemeyi amaçladık. GEREÇ VE YÖNTEM: Çalışmada her grupta 6’şar erkek rat bulunan toplam 4 grup oluşturuldu. Her gruptaki ratlara boraksın farklı dozları oral yoldan uygulandı. Deney sonrası alınan sol testisler histolojik olarak takip edilerek immunohistokimyasal olarak Claudin-1, Pan Cadherin ve Calretinin ile boyandı ve ışık mikroskobu ile değerlendirildi. BULGULAR: Testis örneklerinde Cadherin ekspresyonunun artan doza bağımlı azaldığı gözlendi. Bununla birlikte Claudin 1 ekspresyonunun gruplar arasında çok değişiklik göstermediği gözlendi. Leydig hücre sayısının ise bir kez LD50x2 doz boraks uygulanan ratlarda azalma gösterdiği gözlendi. SONUÇ: Elde edilen bulgular boraks kullanımının doza bağımlı olarak testislerde kan-testis bariyeri bileşenleri üzerine zararlı etkiler oluşturabileceğini göstermektedir. Bu etkiler uzun dönemde infertilite sorunlarına neden olabilme potansiyeline sahiptir. Bu nedenle bilhassa bor bileşenleri üretim merkezleri çevresinde olmak üzere çevre kirliliği yönünden önemli korunma tedbirleri alınmasının gerekli olduğunu düşünmekteyiz.OBJECTIVE: The long-term use of boron compounds commonly used in daily life has some dose-dependent toxic effects on different organs For this purpose, in our study, we aimed to determine the change in blood-testis barrier structure and the number of leydig cells in the testis of rats in which were given borax at different doses. MATERIAL AND METHODS: In our study, 4 groups, in each have 6 male rats were made. Different doses of borax were given orally to rats in each groups. After the experiment, the left testis was excised, histologically processed and stained with Claudin-1, Pan cadherin and Calretinin immunohistochemically and evaluated under light microscopy. RESULTS: In testis slides, it was determined that Cadherin expression decreased parallel to borax doses. However, it was observed that the expression of Claudin 1 did not change much between the groups. The number of Leydig cells was observed to decrease in rats administered once with an LD50x2 dose. CONCLUSIONS: The findings suggest that the use of borax may be deleterious to the blood-testis barrier components in the testes. These effects have the potential to cause long term infertility problems. For this reason, we consider that it is necessary to take important preventive measures in terms of environmental pollution, especially around boron components production centers

Comparing the Predictive and Classification Performances of Logistic Regression and Neural Networks A Case Study on Timss 2011

Investigating effective factors on students’ achievement has wide application area in educational studies. Specially, Trends in International Mathematics and Science Study (TIMSS) allows researchers to determine correlates of mathematics and science achievement for different countries. In this study, the predictive and classification performances of logistic regression and neural networks are compared to identify the impact levels of variables on students’ mathematics achievement in Turkey. Age, gender and scales created by TIMSS team for 8th grade students (students like learning, value learning, confident in math, engaged in math, bullied at school, home educational resources), are selected as predictive variables. Model fitting statistics show that two methods give similar results in prediction and classification. In addition to model results, students’ confidence is found as the most effective factor to improve mathematics achievement

A Leucemia Mieloide Aguda Poderia ter se Apresentado Ainda Pior? “Causa Incomum de Trombose Multiarterial Concomitante”

Resumo A leucemia promielocítica aguda (LPA) é um subgrupo da leucemia mieloide aguda (LMA). Embora se saiba que as complicações hemorrágicas são comuns, as complicações trombóticas não são tão raras quanto se pensa. No entanto, infarto do miocárdio e incidência de acidente vascular cerebral isquêmico são muito raros durante a LMA. Aqui, apresentamos o caso surpreendente de LPA diagnosticada com pancitopenia em sua apresentação com infarto agudo do miocárdio e acidente vascular cerebral isquêmico